518 ON TUE nOUSE-FLY INVESTIGATIONS. 



Mixftire x.=2o c.c. caaem. ■^ 1 rtiii. btMizoic acid dissolved in 4 c.c. of 



(59 only) +25 c.c. brown sugar. ( 90 "/(i of alcoliol was added to the 25 c.c. 



+ 25 c.c. banana. ( water (when benzoic acid precipitated). 



+ 25 c.c. water. J The whole was mixed into the mixture. 



Mixture xi.=25 c.c. casein. 



+ 25 c.c. brown sugar. 



+ 25 c.c. banana. 



+ 25 c.c. water, in which the various insoluble substances were mixed. 



Mixture xii.=25 c.c. casein. 

 (92 onlj') + 25 c.c. sugar. 

 + 25 c.c. banana. 

 + 5 c.c. pi'rethrum powder extract (ale). 



Mixture xiii.=12'5 c.c. casein. 

 (121 only) +12"5 c.c. brown sugar. 

 + 12'5 c.c. banana. 



+ 12-5 c.c. of (^^ exol. mark iii. + 1 % mustard oil + 0-25 ethyl sulpho- 

 cyanide). 



Mixture xiv.=12"5 c.c. casein. 

 (122 only) +12"o c.c. brown sugar. 

 + 12'5 c.c. banana. 

 + 12'5 c.c. 1 : 20 ethyl thiocj'anide + cinnamic + exol mark iii. 



Mixture xv. = Brown bread soaked in (1 c.c. exol mark iii. + 1 grm. sugar +18 c.c. 

 (128 only) water). 



ili"i.r^?«!*e xvi.=Paper sprayed with (1 c.c. exol mark iii. + l grm. sugar + 18 c.c. 

 (129 only) water) and allowed to dry before fed to flies in cj'linder. 



Mixttire xvii. = Brown bread soaked in 3 drops ethyl sulphocj'auide + 25 c.c. water. 

 (130 only) 



Iodine =5 c.c. of (1 grm. iodine dissolved in 5 c.c. of 90 f"/,, alcohol). 

 (14.1 only) 



(NB. — All solutions aqueous unless otherwise stated.) 



